Three specimens of rutile were ~repar~d and the dielectric properties studied over a range of frequ.ency and te~perature. A dlelectnc constant of approximately 100 was found which :emamed su~stantIally ~onsta?t through the highest radiofrequencies, falling o~ only in the I~fra-re? regIOn. The dielectrIC losses are low, particularly at the higher frequencies. The dlelect.rIc constant decreases with increasing temperature, having an average temperature coe.fficlent of -8.2 X 1O-4 ;oC. An exponential relationship between conductivity and the re<;lprocal of t~e absolute :emperatur~ hol~s for rutile in the higher temperature region. Mixtures of r.utIle po~der With other dlelectnc materials obey a logarithmic mixture formula. Two .mechamsms .whlch have ~een proposed to explain the high dielectric constant of rutile are discussed. A simple mechamsm based on the Clausius-Mosotti equation is described.
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